Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
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Solve the triangle. Round lengths to the nearest tenth and angle measures to the nearest degree.a = 9, b = 13, c = 16
A. A = 32°, B = 54°, C = 94° B. A = 36°, B = 52°, C = 92° C. A = 34°, B = 54°, C = 92° D. no triangle
Solve the problem.The ferris wheel in the figure has a radius of 42 meters. The distance between the top of the ferris wheel and the ground is 91 meters. The rectangular coordinate system shown has its origin on the ground directly below the center of the wheel. Use the coordinate system to write the equation of the circular wheel.
A. x2 + (y - 49)2 = 842 B. x2 + y2 = 422 C. x2 + (y - 49)2 = 422 D. x2 + (y + 49)2 = 422
Solve the problem.Find the length of a rectangular lot with a perimeter of 140 m if the length is 6 m more than the width.
A. 70 m B. 76 m C. 32 m D. 38 m
Provide the proper response.Tell whether the statement is true or false. If it is false, give the correct answer. Explain your answer. The easiest way to simplify the expression 
is to multiply both the numerator and denominator of 
by 
.
What will be an ideal response?